Richard Smith's blog

Tower Bridge Meets CFD

Complete, watertight, complex geometry is a rare but welcome find in Computational Fluid Dynamics (CFD). However, thanks to the steering committee of the upcoming 23rd International Meshing Roundtable, such a geometry, in various formats, is freely available for their meshing contest. The star of the contest is London's Tower Bridge, I presume in honor of the conference's host city. So to the bat cave to see what Caedium Professional can do with this model.

Tower Bridge Caedium CFD SimulationTower Bridge Caedium CFD SimulationVelocity contours

How to Make a Splash in CFD

It is a common occurrence: a rain drop falls into a puddle; a leaky faucet drips into a sink of water. This seemingly simple event has some complex physics in play that advanced multi-phase, free-surface (volume of fluid - VOF) Computational Fluid Dynamics (CFD) can simulate. Not only can CFD simulate water impact in a pool, it can also produce a beautiful 3D visualization of the process as an animation. Follow along to see how you can use Caedium Professional to simulate a water droplet falling into a pool of water.

VOF Free Surface Caedium CFD SimulationVOF Free Surface Caedium CFD SimulationDroplet crater

Caedium CFD Sneak Peek: Passive Species Transport

The next release of the Caedium CFD software system will be able to simulate the convection and diffusion of a passive species, also known as a passive scalar. A passive species can represent and track additions such as smoke in airflow and dye in water. It can also provide insights on the dispersion of pollutants carried by a fluid.

Caedium Passive Species CFD SimulationPollutant plume released in air from a chimney

Automated Creation and Export of CFD Results

Previously I showed how to automate a sequence of Caedium Computational Fluid Dynamics (CFD) simulations of an alpha sweep for an airliner. Next up I will show you how to automate the export of results from Caedium in a specific format. This example focuses on the files required for ixCube 4-10 (the successor to ixForten 4000) to perform a structural analysis using the pressure coefficient (Cp) from an airflow simulation over a tensile structure or membrane.

Caedium Membrane CFD SimulationCaedium Membrane CFD Simulation

Aerodynamics Plays No Role in the Performance of Stationary Bicycles

While I'm sure you know aerodynamics does play a crucial role in outdoor cycling, aerodynamics doesn't offer any performance gains for stationary cycling indoors. With this in mind, hopefully you spotted that my previous blog post "Aerodynamic Performance of a Stationary Bicycle" was a cunning April Fools' Day ruse.

Stationary Bicycle StreamlinesStationary Bicycle StreamlinesNo airflow, no streamlines

Aerodynamic Performance of a Stationary Bicycle

Aerodynamics plays a crucial role in the performance characteristics of outdoor cycling. However, no-one to my knowledge has used Computational Fluid Dynamics (CFD) to analyze the aerodynamic performance of a stationary bicycle - at least until now!

SketchUp Model of a Stationary Bicycle and CyclistSketchUp Model of a Stationary Bicycle and Cyclist

Color Maps, Vectors, Streamlines, Action!

Computation Fluid Dynamics (CFD) is synonymous with impressive 3D visualization. Learn more about the basic 3D visualization techniques in CFD and how they can help you reduce the mass of raw data from a simulation into insightful and beautiful graphics.

3D Visualization in Caedium3D Visualization in CaediumCFD simulation of a cyclone

6 Things to Consider Before Switching Turbulence Model

Turbulence modeling for the Reynolds Averaged Navier-Stokes (RANS) equations - the basis of most industrial Computational Fluid Dynamics (CFD) software - is a complex field. Trying to strike a balance between accuracy and computational efficiency has given rise to a relatively large number of different turbulence models. I am not aware of a definitive list to match turbulence models to applications - if you are, please share! With this in mind I'll share 6 suggestions before you consider switching the default turbulence model in your CFD software.

RANS Simulation of Air Flow Around a ChimneyRANS CFD Simulation of Air Flow Around a ChimneyUsing the k-omega SST turbulence model

CFD Simulation Steering

You've already heard some of the advantages of using co-processing over after-the-fact post-processing, but there's more. Co-processing is an enabler of Computational Fluid Dynamics (CFD) simulation 'steering', i.e., making changes to the simulation while it is active.

CFD Simulation Steering in CaediumCFD Simulation Steering in CaediumRelaxation factors changed at 200 iterations

Why Compromise with Browser-Based CAD/CAE Applications?

Why is there an ongoing effort to cram rich interactive 3D CAD/CAE applications into a web browser for desktop and laptop computers yet there is a proliferation of dedicated apps on tablets and smart phones?

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